10
One million. Mega means one million or 106, as also in megawatts.
You can't convert between units that measure complete different things. Cubic meters is a unit of volume; joules is a unit of energy.
There are 1000 joules in a kilo joule
Well the average apple is about 120 calories and 1 calorie is equal to a little less than 4.2 joules. Therefore an apple contains approximately 500 joules of energy.